Description: minor information leak in get_user_ex()
References:
Notes:
 carnil> If this issue is fixed, then one needs to assure
 carnil> to not introduce the privilege escalation issue
 carnil> as present in 4.4.22 through 4.4.28 (cf.
 carnil> CVE-2016-9644) due to a wrong backport/missing
 carnil> backport of 548acf19234dbda5a52d5a8e7e205af46e9da840
 carnil> as well. See notes in CVE-2016-9644
 jmm> Linus prepared a backport for 4.4.31: dc1555e670c373bfa4ca2e1e2f839d5fe2b4501a
Bugs:
upstream: released (4.8-rc7) [1c109fabbd51863475cd12ac206bdd249aee35af]
3.16-upstream-stable: released (3.16.40) [fix-potential-infoleak-in-older-kernels.patch]
3.2-upstream-stable: released (3.2.85) [fix-potential-infoleak-in-older-kernels.patch]
sid: released (4.7.5-1)
3.16-jessie-security: released (3.16.39-1) [bugfix/x86/fix-potential-infoleak-in-older-kernels.patch]
3.2-wheezy-security: released (3.2.84-1) [bugfix/x86/fix-potential-infoleak-in-older-kernels.patch]